Recent studies have shown that structural instabilities play a vital role in segregation of charge carriers in the perovskites, We have used extended x-ray absorption fine structure (EXAFS) to investigate the instability of the CuO(6) octahedra of the La(1.85)Sr(0.15)CuO(4) (LSCO) system showing high Tc superconductivity and the MnO(6) octhahedra of the La(0.75)Ca(0.25)MnO(3) (LCMO) system showing GMR (giant-magneto resistance) properties, Temperature dependent Cu K-edge EXAFS spectra on the LSCO and Mn Kedge on the LCMO systems are reported. The results show a similarity in the lattice instability of the two systems providing evidence for a similar phase segregation of localized and itinerant charge carriers in the two families of perovskite systems.
From Manganites to cuprates: a comparative study of the local lattice instability / A., Lanzara; Saini, Naurang Lal; M., Brunelli; F., Natali; Bianconi, Antonio; P. G., Radaelli. - In: ZEITSCHRIFT FÜR PHYSIK. B, CONDENSED MATTER. - ISSN 0722-3277. - STAMPA. - B 104:(1997), pp. 699-703. [10.1007/s002570050511]
From Manganites to cuprates: a comparative study of the local lattice instability
SAINI, Naurang Lal;BIANCONI, Antonio;
1997
Abstract
Recent studies have shown that structural instabilities play a vital role in segregation of charge carriers in the perovskites, We have used extended x-ray absorption fine structure (EXAFS) to investigate the instability of the CuO(6) octahedra of the La(1.85)Sr(0.15)CuO(4) (LSCO) system showing high Tc superconductivity and the MnO(6) octhahedra of the La(0.75)Ca(0.25)MnO(3) (LCMO) system showing GMR (giant-magneto resistance) properties, Temperature dependent Cu K-edge EXAFS spectra on the LSCO and Mn Kedge on the LCMO systems are reported. The results show a similarity in the lattice instability of the two systems providing evidence for a similar phase segregation of localized and itinerant charge carriers in the two families of perovskite systems.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
